Furnace-door.



G. J. f'. JoHNsoN.'

FURNAGB DOOR.

mumculorr FILED 1120.2, 190g.

Patented Aug* 23,` 1910.

BHEETS-SHEET l.

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ME L CARL d. F. Jmfriscm. 7W mm Av1-vs..

1 n srnrns PATENT ormoni l Gsm.. J. r. manson, or Gramm, omo.

newer.

To all whom it may condom:

Be it known that I, Cnn, J. F. Jonuson,

s. citizen of the United States, residing at Cleveland, in thc'county of'Cuyehoga and Stnteo Ohio, have invented certain new and usefulA Imprtemente in Furnace-Doors, of which the following is a ocilication.

My invention relates to urnace doors, and the invention consists in' animproye ment upon s furnace door'of which I am the inventor and forwhich Letters Patent of the United States were issued October 29, loc?,and numbed 869,575. In the' scid patent the style or type of furnaces iner with which my improved door is eepecinllv intended to be usui issnc-h, for ersmple,'es billet heating furnaces and reheating 'furnacesof one form or snot-her blasts of gaseous :fuel or other excessive heet!producto" agent enrnloved; and in consequence oi which it is dilicult toconiine the gas in the furnace, especially' in cases where there are anumber of openn the weils of the furnace through which etching or thelike may be acconb plisned'. These extreme conditions of heat make itdiicult to maintain effective closure of the furnace and nre es 'of thisapplication an For example, the dooras built in said Letters Potent wasa cast metal structure and lor the mostY part in one piece, and had awuter chamber und an an.' chamber -with draft pessages therefrom intothe furnace, while the water jacket. was provided with both inlet :indoutlet passages or pipes at the 'top of the door. But practical testsdemonstrated that this was an exceedingly faulty construction, becausethe water made sim ly a short circuit from the inlet to the ont et atthe top of the. door, while the water in the other portion of the doorbecon1' ing intexmelyheated, formed steam and PUBNACE-DOOB.

peoitlcstlon of Letten Patent. Patented tlgQ23, 1910. f Appliettox lzdBecemhr 2, 1969. Serial lo. SBLWE. i

thus created a. back pressure against the water supply whichreallyprevented the flow of water et ell es l had lanned. This of course wouldexpose the tense heet of the urnace yvithout protection v or relief,'and with thc-uneven ex ansion and contraction that inevitably o lowedthe door was quicklywerped or cracked and renderedprscticolly worthless.Hence my 65 present improvement, which entirely over comes theseobjections and provides adoor wherein the water und air perform theirVfunctions in the moet satisfactory nimmer and a thoroughly eiiectiveconstruction() 70 .n accompanying s ngen', 1f-*ure 1 is a frontelevation of the door and2 attnched parte, and 2 is an'edgeeleyationthereoi partially sectioned et thehot- 16 3 is 'e pleegt* topview looking down upon Fi 1. Fig. 4 is a view of the doorv looking omthe inside with the ner plate removed and the connecting bolts andair-'tubes in cross section. Fig. 5 is a B0.

Sectional elevation ci the complete door taken on a line correspondingto,ii-4S, Fig.

4. Fig. 6 is an enlarged sectional view of l one of the transverse airtubes; imd showing the xnenner'of connect-ing et its ends 85 with otherparte.

Hnvin reference (x) my new and improved first, that instead of being aunitary structure it is constituted of several distinct and 9 0different' parts comprising a middle or interior part or portion B ofcastmetal and referred to hereinafter as the body. As such the said bodyis of the full sizeof the door' as viewed in outline with e main por- 95tions? having sundry perforations or holes through the same for thetubes 3 and-the bolts 4 as well as having a sto'kingor peep hole 5 and arim 6 entirely .about its edge and extending inward for the ariost'part.10c from the flat mein portion 2.: This body o1;v frame is the only castmetal 4gortion ofthe door and serves as a su pmt fothr parts includinges .cially tli steel pluto Erw which conform to thc out-line of bodyframe. B and nre secured thereto4 :is shown.` That is the face plete Fis fixed to said body by means of screws through its side-` edges,

While rear or inner plate ll, whichl hns t0 119 sustan'the, exposure tothe heut of the fur-Y nace, is secured to said body not only by oor tothe in- 6G oor in detail, it will be observed,

e inner prcferab1y- -and the outer face plate F, ,19?

' screws through its side edges in the edge of rim G but especially bymeans of bolts 4 adjusted and locked upon body B through the variouslyscattered holes over its middle, especially. These ,bolts are threadedat both ends and one end isscrewedinto plate E and the other end passesthrough corre- Spendingr holes in the partition or main flat ortion 2 ofbody B and is locke-d thereon y a jamb nut, 8 on one side and a fastenin nut. 9 on the other side. In practice the said bolts are tirstinserted in plate E and the nuts 8 are then adjusted thereon so as to beuniformly and evenly spaced from said plate, and saidbolts are theninserted in the holes in body B and fastened` by nuts 9. The samepractice is observed with tubes 3 as to both platcsB and E, and leadgaskets l0 are interposed` between the nuts both tubes 3 and S'and 9-inconnection with bolts 4 to prevent possible leakage at said points, andthe peep or striking hole has a wall the full depth of the rim or outerportion 6 of the body B and has inner plate F. z

' :litter materially from that shown and del scribed in my patent, andthe invention I also secured thereto byw screws, l

The rim 6 of the body B extends about yhalf as far outward from theni'ain or fiat partition 2 of the bodyy as itdoes to the rear thereof,and this construction provides an air chamber in the front. portieri oithedoor and a water chamber or jacket in the rear portion thereof'behind partition with the air conducting tubes passing from the airchamber through the Water chamber and bodily exposed therein exceptI attheir ends. The said tubes are arranged about or near the outer ed es ofthe. door in such manner that. theywill discharge the air within thefurnace next about the jamb of the door all around and by drivingbackthe gases therefrom, prevent possible burning out of the said jamb orWall of the furnace. As to this arrangement of said tubes it is to beespecially observed that injection ,of air therethrough carries initialcombustion inward far enough' to effect the ends desired A through .themedium of the intlowing air. Otherwise, or over `the middle'portion ofthe door there is no such danger and hence solid bolts are four i bestfor this portion of the door structure. Again, in stoking cerf tainlarge furnaces the labor of several men frequently is required to handlea single stoking bar or poker. Hence I conceived the idea of a roller Kto rest he bar upon at the front and bottom of stolting hole 5 andwhereby half the labor formerly required can do the same work with muchmoreease and facility.

Water and air supply may be wholly. at

, the top of the furnace door by pipe connections N and M, or air pipe Mat the top may be closed and the supplyl of air be by pipe P injectedunder suitable pressure into mouth 16 in the side of the door, and theexhaustof water is by pipe O while the air goes to thel furnace by ductsor tubes 3.

As to the Water supply pipe N, said pipe is shown as extending down intothe water chamber or space in the door near the bottom thereof, whilethe exhaust O is from the top of the door. Thus the Water is caused totraverse the entire depth of the door o find the outlet andV allportions thereof are uniformly cooled and there are 'no steam pockets orthe like possible anywhere to malte the cooling uneven or to defeat thefreest possible circulation of the water. The door as a whole is'designed to be bodily raised when opened and any suitable con neetionswith the several pipes M, N, 0 and l may be made to permit'suchmovement, whether the connection be by hose or sliding or jointed pipesof any available or preferred const ruction. The hole or opening 5 inthedoor has the usual lid or cover 17 adapted to swing over the same fromthe l side and above or over roller R. i In operation the door hereindoes no not show the slightest tendency to buckle or become distorted orcrack in any part.. The air is delivered to the door by pipe M or l isunder more or less pressure as coni ditions may require, and a blower orother device to supply suchpressure may be employed, the object being toproduce or promote such flow of air through the tubes El Aas willellectually prevent accumulation of combustible gases about the edge ofthe door and the jamb and the consequent destruction of the brick Workas above des scribed. down or separable as occasion may demand,

i so that if for any reason anypart or portion thereof shall requirerepair or replacement the same can be done Without loss or destructionof the remaining parts. This is important, because if the door were aThe structure as a whole is knockunitary or single piece structure as inmy patent the impairment of a portion would necessitate the discardingof the entire door, which was and is a very serious objection. IVhat Iclaim is:

` 1. A urnaf edoor havingawater chamber in its inner'side and an airchamber in its outer side and constructed with a. body prof ridingavpartition between said chambers, and' separate inner and outer platessecured upon their edges to said body, and separate an' conducting tubesfixed at their ends in said body and 'said inner plate respectively.

i 9eme?l 2.A hollow furnace doorrconsisting of a body having,- n rimabout the same and, inner and outer plates fixed at their edges' vtosaid rim, said body dividing the door intoA front and rear chambers,bolts connecting' said inner platev with said body at intervals over itsmiddle portion and air conducting tubes connecting said plate about itsedge with said body, said bolts and tubes being alike screwed into saidinner plate and secured b v nuts to said body. l

. 3. A furnace door having front and rear A cha'mbers with a division svall between j them, 15

a plurality of transverse tubes threaded into 'the outer wall of one ofsaid -cbalnbers andextending through said divisin wall into the otherchamber,` and a jam nut and a fastening nut on each tube engag- Y ingthe same on opposite sides of said division wall.

4. A double chambered furnace V'door having a series of tubes openvtoone of said f chanibers and passing .through the other chamber, separateouter plates for said chambers respectively and' a central part to whichsaid plates are secured having said tubes removably fixed therein.

5. A furnace door with inner and outer Chambers having; each a separateouter plate and a central member with a rim extendin about the outsidevof said chambers an dividing the same and said plates -remov-.

`in presence of two witnesses.

CARL J. F. JOHNSON.

witnesses y E..M. FleHER,

F.` C. MUSSUN.

